I jammed my thumb on a ball 4 weeks ago and it still hurts to make a fist. should i see a doctor or just keep it in brace longer?

Definitely see doctr: you may have broken something or torn something, but at 4 weeks it may be too late to do anything, I would still get it checked. I jammed my toe on a bed frame, and actually broke the toe, took 3 months to heal

Yes: Although a blunt injury can take weeks to fully recover, any such injury involving a hand must be taken very seriously. The hand and its fingers have such intricate anatomical elements that should be evaluated by a hand specialist. If you do not have access to such a specialist, at least consult an orthopedist